What is message authentication
Explain what is meant by the term message authentication? Describe the classes of message authentication function.
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It is defines as a procedure which verifies if the received message comes from the assigned source has not been changed.
Classes of message authentication function are as considered as:
a) Message encryption : The whole cipher text could be used for the purpose of authentication.
b) Message Authentication Code : It is defined as a function of the message and secret key generate a fixed length value.
c) Hash function : This function maps the message of any length to the fixed length that serves as the authentication.
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